DE1941736C - Method for boxless molding machines for shooting in the molding sand and machine for carrying out the same - Google Patents

Description

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In the patent 1 583 526 there is a method for producing and on the other hand reducing the desired imagination horizontally divided boxless sand molds, compacting effect when shooting in. Besides that by means of a double-sided horizontal model plate, it is inevitable that in the area of the attachment mold frame and vertically movable ram provide the piston rods on the rams placed under protection, in which the molding sand 5 insufficient molding sand conveyance into the molding frame above and from below in above and menraum.

Mold frame located below the model plate- By the present invention, the task is to be filled in and which will then be solved, in a further development of a substantial pressed form by horizontal retraction of the step of the model plate in the main patent i 583 526 in the molding machine on a _l0 under protection provided sand mold manufacturing method horizontal conveyor line is pushed out. This rens forming molding sand injection process that forms the injection of the molding sand into the mold so that the mentioned small frame spaces from above and below in deflections of the molding sand flow at the through connection with the subsequent pressing of the rütsöffnungen the ram and the resulting forms the A prerequisite for the resulting wear and tear to be avoided and given the strength required for the and that, in addition, a completely identical, undamaged pushing out of the molding sand over the machine through the re-entering model plate over the entire effective area of the press ram is absolutely necessary. is ensured, so that actually the full pre-compaction effect strived for in the process according to the main patent ao when shooting in 1583 526 takes place so the compaction of the molding sand in the molding frame achievable sand in such a way that first the molding sand is.

This object is achieved according to the invention through openings of an upper and a lower press, that the molding sand on its way stem feeds through in above and below a 25 to the ram in two partial flows double-sided, horizontal Model plate is arranged, the cross sections of which correspond to the nete mold frame and thus correspond to full punch surfaces, and that the forces acting on the already pre-compressed to a certain extent and subsequent machine punches outside the molding sand thus shot through against these font sand flows works,
lateral relative movement of the press ram furthermore. The method according to the invention brings about seals. This, compared to the earlier customary molding sand injection process, the essential difference in its first phase, completely new process has the improvement that the two molds in the mold frame of the not only have the advantage that the two mold halves of the machine do not inject molding sand streams during the pneumatic filling of the mold frame in a way by any direction perpendicular to the force transmission to the plane of the model plate "awake machine parts serving to the press ram" are disturbed, in which the pressing of the mold and consequently the sand according to the invention and the pulling out of the model halves from the desired precompaction of the Molding sand takes place in the finished mold halves, but that even shooting in over the entire effective area is ensured when the molding sand is introduced into the two rams. In addition, the mold frame ensures an effective pre-compression of the same - there are signs of wear and tear on the perforations, so that damaging slipstream openings in the press ram are also avoided. The effect of the model avoids the fact that the press rams are now more sparing of the two forces acting outside the molding sand flows than the model halves with regard to the sandblasting effect Pressing of the molding sand excluded,
is guaranteed. In the main patent 1 583 526, among other things, however, it is not very easy to machine a box-less molding machine with a pneumatically correct and to a large extent table molding sand injection device, vertically progressive basic idea of the pressure-medium-actuated, moveable in the main 50 with molding-sand patent registration under protection of the injection-passage openings provided with a press ram, to be implemented. The press ram is vertically displaceable, with molding sand passage opening, for the application of this process in a well-equipped counter ram, vertically movable frame of boxless molding machines, pressurized mold frame and horizontal by model plate that engages in the center of the ram and can be shifted in a straight line through the zontal -Druckmittcliintriebc actuated piston rods required.

leads and this requires that inevitably by In further training and improvement of a

the openings of the press pins through into such a boxless molding machine is one such

Mold frame spaces to be shot molding sand over according to the present invention characterized

the annular spaces 60 surrounding these Knibenstangen that the edges of the ram and the

must be supplied. Minor deflections of the counter stamp on each of the telescopic extensions

the cinzuschießenden in the mold frame mold walls of an upper and a lower, respectively

the from its original, can be acted upon in these annular spaces with pressurized gas, fixed, the

assumed flow direction to the opening of the respective molding sand partial stiom leading, pipe-conveying

In relation to the pressing stamp, it is therefore inevitable that 65-shaped sand chambers of the molding sand injection

not avoid and these deflections are fixed and that the means for power

r.achen on the one hand an undesirable wear transfer to the ram or to the

the Preßstcmpel on the molding sand passage openings and counter stamps on these telescopic extensions

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□ which attack the stamps themselves radially outside of these telescopic extensions.

Disturbing piston rods are therefore avoided in the molding machine according to the invention.

In a further development of the molding machine according to the invention, the cylinder of the pressure medium drive of the ram of such a boxless molding machine oinen annular cylinder space cross-section also forms the pipe wall of the sand chamber associated with the ram and houses an annular piston, which has an annular cross-section, the telescopic extension of the Sand chamber wall representing piston rod is connected to the plate-shaped ram.

According to a preferred embodiment of the invention, the counter punch is also by means of a Pressure medium drive movable and the cylinder also this pressure medium drive has an annular Cylinder space cross-section, the cylinder also being the pipe wall of the counter punch associated sand chamber forms una an annular piston houses, which has a cross-section annular piston rod with the telescopic extension of the sand chamber wall plate-shaped counter punch is connected.

From U.S. Patent 1021938 it is in Connection with a vertically operating boxless molding machine known per se, except for one, by means of a pressure medium drive vertically movable press ram also one by means of tines Provide pressure medium drive vertically movable counter punch. This counterstamp is used, however not as a press ram.

In the French patent 1 388 177 a machine for the production of horizontally divided boxless sand molds described, which have a double-sided, by means of a pressure medium drive to a horizontal pivot axis within a vertical plane upwardly pivotable model plate, one lower and an upper, each vertically displaceable by means of a pressure medium drive, each from bottom to top pyramid-like tapering shapes, one lower and one upper, respectively also adjustable by means of a Druckmittelanttiebes ram and a molding sand injection device has, by means of which the molding sand via lateral contactors of the molding frame in the Mold frame spaces is blown.

In this machine, the molding sand is also introduced into the mold frame spaces pneumatic, but the direction of flow of the blown molding sand-compressed air mixture is transverse to the Pressing direction and transverse to the direction of pulling the model halves out of the finished mold halves. This means that the two halves of the mold when the molding sand is blown in in this transverse direction "Grow up", whereby there is not only a strong slipstream effect of the two model halves noticeable, but also a considerable wear and tear on the model must be taken into account. For the same reason, this known machine is only suitable for molding relatively lower Models. A particular problem in this known machine is the seal between the laterally arranged connection piece of the molding sand blow-in device and the side Molding sand inlet openings of the upwardly tapering. vertically movable mold frame.

Since, in contrast to shooting in, when blowing in the eiii / .iibla: .end molding sand, it is much stronger is mixed with compressed air, in the known machine, when blowing in, there is a conversation strong sandblasting effect, which not only practice the strong model wear and tear already mentioned, but, in general, very strong wear and tear on all machine parts that carry sand has the consequence. A relatively large amount of conveying air is required for blowing in, which is why it is not only necessary to ensure that such a large amount of compressed air is continuously available, but also for a sufficient discharge of the resulting exhaust air, if there are no air pockets in the sand molds are to be risked. Because of the blowing of the molding sand into the mold frames across to the pressing direction of the known machine, this occurs anyway when blowing in, as opposed to shooting in very little pre-compression of the molding sand in the wrong direction, which is associated with the The slipstream effect of the model leads to an uneven density distribution of the molding sand within the mold frame leads. The result is that during the subsequent compression of the blown Formas sand by means of the two press rams with reference eccentric reaction forces occur on the piston rod centers, which cause tilting of the Press ram may result.

In contrast to this known boxless molding machine, in the case of the invention boxless molding machine any damage to machine parts carrying sand as a result of the sandblasting effect does not occur because, in contrast to blowing in when shooting in, the one to be introduced Molding sand only to a very small extent, only due to the required flowability is penetrated and, moreover, the suddenly expanding compressed air, so to speak, only as a propellant charge for the molding sand plug to be introduced is used. For the same reason there are in the invention Machine also no difficulties with the removal of the exhaust air, since it is practical almost no compressed air got into the mold frame. When the machine according to the invention takes place A considerable pre-compaction of what has been introduced into the mold frame even during sighting Molding sand instead, so that when re-compacting by means of the odor of the press ram only a proportionately low compaction power is to be applied or overall »: in a significantly higher degree of compaction and thus a much better dimensional stability can be achieved than with known machines. this has its reason in particular durin that the precompaction of the molding sand when shooting in the in the same direction as then the Nachverdichtur.g by means of the ram. As the compression directions in both cases are concurrent with the directions in which the extraction the model halves from the finished mold halves and the extension of these mold halves the mold frame takes place, the sand sealing component lies also in this respect extremely favorable. Because with the machine according to the invention on the one hand, the injection of the molding sand into the 65 mold frames over the entire cross-section the mold frame completes and on the other hand, central piston rods for moving the or the Press rams are not provided, but in the Gc-

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on the contrary, the force applied by the pressurized fluid system to it can be in the two separate pressurized gas

ticn StempclfMiidern takes place, the lines are tilted by separately arranged valves

Ficl'.siompel excluded when repressing. common control mechanism optionally equal

In a further development of the invention, the pressure is timed or with adjustable mutual timing

millclanlriebc to move the Formralimen radially 5 offset can be actuated.

outside the telescopic part of the sand chamber- The molding sand filling device of the invention

Wanclungcn arranged and these preferably have moderate box-less molding machine points expediently

also in cross-section annular cylinder chambers opening upwards, into the from above

mil ring-shaped piston. Through such a molding sand bunker opening funnel, the

Formation of a knmnlnsen molding machine, the to is at the bottom by a pressure medium-actuated hori / on.al-

According to the invention, the method can be closed in an ideal manner, which can be displaced by a, in

really. a horizontal guide movable carriage and

In addition to a further feature of the invention, the one with it is preferably spring-loaded

Openings in the rams funnel-shaped. Sol handlebars attached, with a lower seal

chc is preferably built in large numbers symmetrically 15 -shaped horizontal locking plate,

ordered and at the same time relatively narrow in the closed position due to the toggle action

On the one hand, molding sand access openings avoid tightly on an upper opening of the molding sand container

Sand solidifications and cause on the other hand to touch down.

In a further development of the invention, the model is practically vertical sand flow direction. ao plate guide as gas-tight, via controlled Venin As a modification of this, the press ram can be connected to a pressurized gas source or to a vacuum opening formed between in the stamp plane rust-like umquelle connectable channel and the arranged, preferably louvre-like, around their model plate is with longitudinal axes on the front, in the correct direction be formed rotatable strips. graded dimensioned sealing folds, which at ir The PrcßMcinpel have the forehead of the model plate retracted into the mold frame 15 facing ropes expediently vent openings on the side of the duct closes off gas-tight duct openings. Zui gen. the hollow sealing of the channel-shaped model plate guides formed in the stamp body rooms have connection, which in turn can also be inflated as a modification of this Do not use air cuffs on channels opening into the outside atmosphere.

connected or loaded with vacuum or overpressure

are impactable. As a result, on the one hand, the molding machines according to the invention are generally used for Mo

shoot the molding sand into the mold frame a dent of all kinds as well as for the production of small odei

F. causes ventilation of the latter and, on the other hand, a large number of items or also for individual items

Lifting the ram from the finished sand - small to large dimensions can be used. Sit

shaping easier. 35 are auto in all their essential functions

The perimeter of the press rams are functional and can be purchased with a low investment

Realize moderately exchangeable, piston ring-like strips and and operating costs. All inner surfaces

at which the mold frames facing the mold frame spaces run parallel to one another unc

Sides are expediently exchangeable coverings for each model plate at right angles. The filling of both

because made of wear-resistant material. The 40 mold frame spaces are made by explosion-like

Preßstcmpel are preferably square or air supply from above and below, ir

Rectangular and have an even cross-section, which precedes the sand chambers on both sides

such mold frame together. The inner walls contain the spaces of the molding sand injector

this form frame are advantageously precisely preferably the air supply perpendicular to the Rieh

vertical, d. H. at right angles to the rams and 45 direction of the sand feed, which is done by jalou

to the model plate, whereby a perfect si-like guide sheet can be achieved, wel

Height adjustability of the mold frame spaces and, before that, the direction of the air flow before and after

with any height variability of the final impact on the molding sand set, with purpose

shape results. Advantageously, the internal dimensions are indicated by di <during the shooting-in process at the same time

Rope the mold frame with an exchangeable 50 model plate through the air from the!

Able plates made of wear-resistant material is vacuumed out mold frame spaces. When withdrawing

clothes. ö τ mold halves from the model plate is used for ver

According to a preferred embodiment of the improvement of this process, compressed air by the Mo

the upper and lower sand chambers are brought up through the slab.

together with two molding sand lines and one

this interconnecting connecting line drives as ring drives causes that in front

a C-shaped in the vertical plane, the given stroke the lowest possible height

Schinenrahmen representing sand container, which is on, so that the way that the molding sand when a

upper C-arm one must pass through with a sand bunker in a closure into the mold frame spaces

bond filling device and one of two 60's short. The annular piston of this pressure

Pressurized gas lines and the central drives on the lower C-arm, which are equipped with cylindrical, i.e. H. in

has another pressure gas line. Such a con-cross section of annular piston rods versehei

Structure is particularly simple in its structure and there are openings in the latter for printing

nevertheless able to withstand tough conditions. The balance show. The be on the piston rods

Both compressed gas lines can either be of a fixed plate-shaped ram are advantageous

only one, connected to a pressurized gas container is liable to be provided with cavities that are connected to the

and a single valve containing compressed gas to the mold frame spaces facing vent

Guide lines branch off or, as a modification, have openings in connection. There both ring

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Piston of the annular pressure horizontal guide 103 in cross-section, in which central drives have the same surface dimensions, a model plate D designed as a carriage is connected in parallel in such a way, it prevails in each case that they do horizontal displacements, but the same in both cylinders at the same time cannot experience any vertical displacements. Pressure, so that practically no reaction forces on 5 In the F i g. 1 and 3 of the drawings is the widening of the model plate and the machine foundation in a boxless molding machine 101 in a work stretcher. By means of the filling according to the invention, in which the model plate D device is located, the molding machine can be in the molding position and in which the upper molding sand to be refilled is in each case based on a mold frame Ca with its lower edge and the sand level measurement with an electrical i »and sensor io lower mold frame Cb with its upper edge to be refilled. The sand refill can rest after the top or bottom surface of the model plate, each mold making process by a single work step of the system in FIG. 3, the two press punches Ba and Bb. The one shown in the so-called filling position, ie the pressure of the compressed air in the compressed air system, can be kept relatively low when the upper ram Ba is in its uppermost position, which in turn helps to protect the models and the lower ram Bb. himself in its lowest position.

The invention will now be made with reference to According to the invention, the vertical displacement

attached drawings showing a preferred shift of the two, in horizontal cross-section such as

Execution of a molding system according to the invention, the two molding frames interacting with them

show. in their details, for example, a ° men Ca, Cb preferably square press dies

ben. In the drawings represent pel Ba and Bb serving pressure medium drives Fa

F i g. 1 is a schematic partial side view of a and Fb designed as a ring drive, ie their press

Preferred embodiment of a nominal cylinder chambers 104 are in the horizontal cross-section

moderate sand mold making facility. preferably circular and in these there are

F i g. FIG. 2 shows a partially sectioned partial plan view of »5, preferably circular ring-shaped pistons 105

the in F i g. 1 shown system. out, which via piston rod elements 106 with

F i g. 3 shows a partial section along the plane IH-III of the press rams Ba and Bb assigned to them

in Fig. 2, are connected.

F i g. η a partial supervision of the in F i g. 1 are preferably shown, as in FIG. 5 of the drawings system, shown in the direction of arrow IV in FIG. 1, also see the pressure medium drives Ea and Eb. (the latter not shown in the drawings) for Fig. 5 a schematic partial vertical longitudinal vertical displacement of the upper and lower mold section through a modified embodiment frame Ca or Cb designed as a ring drive, the mold frame and press ram arrangement of the in annular cylinder spaces 104 ' verkastenlosen molding machine 35 of the sliding piston ring according to the invention 105 'and 106 via corresponding KOI-molding plant, benstangenelemente' are connected to their associated FIGS. 6 through in each schematic partial vertical mold frame Ca or Cb. This for the longitudinal sections through the boxless molding machine vertical displacement of the two mold frame Cc of the in F i g. 1 to 5 but shown erfindungsge- Cb serving pressure medium drives can MAESSEN sand mold production plant in various 40 also, as shown in F i g. 4 of the drawings, the operating positions are shown. Have the form of ordinary pressure medium drives. Da-The F i g. 1 of the drawings shows, in side view, preferably two printing means, one drive Ea or Eb, generally designated by the reference number 101, arranged diametrically to one another, boxless molding machine with an adjoining canting of the molding frames Ca or Cb , generally with the reference number 102 be avoided.

drew finished mold conveyor line. If the pressure medium drives Ea. Eb according to be-The machine frame of the boxless molding machine, the preferred embodiment of the invention as a ring rail 101, will be implemented later in particular with reference to drives, have their piston rods on FIG. 3, to be described, the elements 106 preferably form the shape of Hohlzy molding sand introduction device. The 50 alleviate, which by the end face, as a gland boxless molding machine 101 has an upper formed annular slots of the annular press-ram Ba. a lower ram Bb, the cylinder step outwards and in this way an upper mold frame Ca and a lower telescopic extension section through the radially inner mold frame Cb . For the vertical displacement of the walls of the ring cylinder formed, cylindrical form frame Ca is used to represent a pressure medium and drical cavities. If according to FIG. 6, Ea (FIG. 4 or 6), which in the other figures of the drawings also omitted the pressure medium drives Ea for the sake of clarity, and for and Eb the mold frame Ca or Cb as a ring-on vertical displacement of the lower one Form frame Cb drives are formed, the piston rod of which must serve an element 106 'identical to the pressure medium drive Ea, for example as individual rods:; o Pressure medium drive, which for the sake of clarity 60 must be designed and arranged so that it is not shown in the drawings and is free from circulation Power transmission from the horizontally opposite direction acts. The vertical displacement of the circular annular piston 105 'in the cross section of the upper ram Ba takes place by means of a horizontal cross section of the preferably square pressure medium drive Fa and that of the lower mold frame Ca or Cb is ensured.
Press plunger Bb by means of a reversed line a ₅ The t-guide 103 of the pattern plate D finds its effective pressure medium drive Fb. Preferred continuation in guide rails 107 of a cross in the horizontal center between the two carriages 108. its transverse guides as on the Ge pressure medium drives Ea, Eb or Fa. Fb is a ceiling suspended guide rails 109

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are formed, in which a compound slide 108 is guided by means of rollers. In Fig. 1 of the drawings, a second model plate D 'is shown in the rest position, which is guided in guide rails 107' of the cross slide 108 parallel to the guide rails 107 and can be used in place of the model plate D by corresponding transverse displacement of the cross slide 108 along the cross rails 109 .

In the preferred embodiment of the invention described here, the model plate guide 103 is designed as an essentially gas-tight channel, the frontal passage openings of which are provided with corresponding frame seals 110, 111 in the shape of the model plate through functionally correct arranged stepped folds 112, 113 of this model plate be sealed.

On the pattern plate D is expedient via a resilient intermediate element 127 α a thrust jacks 127 /> befesii in the form of a vertical plate ₆ t, WEL »o rather the ejection of the molds produced in the flaskless molding machine 101, respectively after completion of each time re-insert the pattern plate D causes from their rest position to their working position. »5

The respective finished form ejection from the boxless molding machine takes place in such a way that the ejected The finished form only needs to absorb a fraction of the thrust needed to advance it of the finished molding strand is required along the molding strand conveyor line. This avoids that the finished form produced and pushed out by the casting molding machine is too large Is exposed to shear forces and thus destroyed.

1 and 2 of the drawings, the molding system is shown in a state in which the pattern plate D is in the molding position and in which the pusher 1276 of the pattern plate has just pushed a finished mold 143 out of the boxless molding machine 101 onto the molded strand conveyor line 102 .

With reference to FIGS. 2 to 4 of the drawings, the device for introducing the molding sand into the boxless molding machine 101 of the sand mold manufacturing and transport system according to the invention will now be described in detail. As mentioned above, the system of the invention forms, in the illustrated embodiment, the molding sand Einschießeinrichtung the same time the frame of the flaskless molding machine 101. The zeroing of the molding sand in the mold frame spaces takes place according to the invention from above and below through corresponding openings of the two ram Ba and Bb through.

The pressure pipe 149 of a blower 150 is connected to a compressed air tank 151, from which already each have an upper and a lower, in each case a control valve 152a and 152 b containing compressed air lines 153 a and 153 b branch off, which in a generally denoted by reference numeral 154 * o Molding sand containers of the boxless molding machine 101 open. This molding sand container Ί '-' Α consists essentially of an opening into an upper sand chamber 155a upper Formsancileitung 156a, ~: ner in a lower sand chamber 155 b opening into the lower mold sand line 156 b and the two molding sand lines 156 a and 156 b interconnecting Formsand- Liaison management. At the top of the molding sand container 154 is a mold filling device, generally designated by the reference numeral 158 , which will be described in detail later. The upper sand chamber 155 λ and the lower sand chamber 155 b are each formed by the Rirtgzyündern of the press piston pressure medium drives Fa and Fb and their telescopic extensions 106 adjoining the press rams Ba and Bb. As in particular from FIG. 3 of the drawings, the entire molding sand container 154 forms within the vertical center plane of the boxless molding machine 101 a substantially C-shaped unit representing the machine frame, the vertical limb of which is formed by a molding sand connecting line 157, while the two C-bends of the molding sand lines 156 a and 1566 are formed, which hold the pressure medium drives Fa, Fb for the ram Ba, Bb and the pressure medium drives Ea, Eb for the mold frames Ca, Cb at their respective opposite leg ends, essentially in the horizontal center plane of the C construction, the guide 103 for the model plate D is arranged, which, as already mentioned above, is preferably designed as an airtight channel and which is provided via a channel from FIG. The flap valve 159 shown in FIG. 2 can be connected to the suction line 160 of the compressor 150 and via a flap valve 161 also shown in FIG. The molding sand passage openings 163 of the two press rams Ba, Bb of the boxless molding machine 101 preferably lift the shape of passage holes or passage slots with a conical profile, the conical tapering either, as in FIG. 3 may face the mold frame spaces or, as shown in FIG. 6 shown, the sand chamber 1 j may face. In the case of the slot shape, the passage openings 163 can be formed between grate-like bars penetrating the relevant press ram. In the embodiment shown and described here, the molding sand passage openings 163 of the ram Ba and Bb cannot be closed. In a modification of the invention, which is not shown in the drawings, these molding sand passage openings can also be provided with controlled or uncontrolled closures, whereby again in the example of slot-like passage openings 163 formed between grate-bar-like bars, these bars can be controlled or uncontrolled rotatably about their longitudinal axes can, so that in the transverse position they close the molding sand passage openings formed between them like a louvre while they form conscious slots in a vertical position between them. Both in the compressed air lines 153 a, 153 i »and in the molding sand lines 156 a, 156 b, 157 and in the two molding sand chambers 155 a, 155 b can be arranged in the drawings, not shown, shutter baffle.

The molding sand filling device 158 has as wesent Liehe components with a not shown! Sand bunker or a molding sand conveyor track connected to the filling funnel 164. Locking guide rails 165, one in these guides; railed locking carriage 166 and a handlebars 167 ίρ this Verschhißwagen aul

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suspended, form on their underside with a seal 168 154 of the boxless molding machine 101, alternate

provided closure plate 169 on. This closure is a particularly useful embodiment de

Plate 169 acts with an upper, flange-like form machine, since with such an arrangement Ver

formed opening mouthpiece 170 of the molding sand edges of the ram Ba and Bb almost completely

container 154, which are closed above the lock 5 and thus one for the implementation

branching point of the upper molding sand line 156a of the method according to the invention is important "

between the upper sand chamber 155 a and the requirement is met, namely one possible

Molding sand connecting line 157 arranged in such a way with great dimensional accuracy and angular accuracy dei

is that when the closure is opened, the finished molds 143 to be produced.

Funnel 164 sloping molding sand is evenly io The two compressed air control valves 152a and 152i

distributed in both directions. The closure are either st by means of a control device

car 166 is controllable by means of a pressure medium drive 171 that both compressed air lines 153a or

between an open position and a closed position 1536 simultaneously from the compressed air tank 151 mi

movable back and forth. The handlebars 167 are acted upon by compressed air or that between

Torsion springs (not shown in the drawing) are intended to act on one compressed air line

moderately preloaded in such a way that the sealing plate and the other compressed air line have a certain:

169 lies in the direction of the closing movement of the printing delay interval, the length of which is intended

turn center drive 171. This achieves that it is moderately adjustable. Since such controls ar

that the closure plate 169, if they are familiar to the person skilled in the art when they are reached, is the control unit

the closed position on a stop 172 of the filling ao is not shown in the drawing and is the same

Opening strikes, toggle-like on the flanges in the context of this description also not widerei

this opening is pressed. This is how it is described. As a modification of the invention, ar

an airtight, trouble-free working molding sand point of the two from the compressed air tank 151 ge

Safe container lock, which in particular separates branching compressed air lines 153 a unc

it is particularly wear-resistant if, for example, »5 1536 each with separate control valves 152«

the seal 168 of the closure plate 169 from one or 1526 also a single one from the compressed air tank

wear-resistant plastic such as B. Teflon. 151 branching compressed air line with only one

All single control valves that come into contact with Formsa-id are provided, which sicr

Walls of the molding sand injection device, .ns- branches behind this valve to then with

in particular, all of the molding sand lines and the two branches in relation to the compressed air

the molding sand chambers 155a and 1556 are supply lines 153a, 1536 in the manner indicated

preferably with interchangeable coverings made of molded sand container 154 of the boxless molding machine

coated with wear-resistant, molding sand-repellent material. 101 to merge. Such a modified version

Instead of air, the compressed air supply according to the invention can of course be used for the approximate form

Any other suitable gas can of course be transported to the sand mold container 154

For example, nitrogen is also used, no individual control of the compressed air supply

if this is appropriate for any reason. on the one hand to the other sand mold chamber 155a unc

In the two rams Ba and Bb can on the other hand to the lower sand mold chamber 1556 dei

According to a further development of the invention, dit '.- the boxless molding machine 101, but only one

Drawings is not shown, in each case on the 40 each simultaneous application of the two sand

each associated mold frame spaces facing molding chambers with compressed air,

th stamp sides vent openings arranged As above with reference to the F i g. 1 and 7

be, which open into punch cavities, which of their drawings was set out, can in conjunction

on the other hand, via ventilation channels with the external breathing with the compound slide 108 each two months

Sphere connected. The purpose of these 45 dellplatten D or D ' optionally with the boxless

Vents and ducts are brought into cooperation in molding machine 101

First and foremost, the air evacuation from the two molds will be. As already mentioned above - some

frame clearing during the molding sand injection has the advantage that on the one hand the molding machine

in these mold frame spaces from the molding sand chamber with a model plate in the sense of the production eini

mern 155a or 1556 can be operated via the press ram opening 50 specific series of molds, while

fen 163. As a modification of this, these ventilators can be used on the other hand at the same time on the other model

vents or ventilation channels can also be made on the plate of the model change

Suction line 160 or pressure line 149 can connect. Fig. 2 shows in its upper half the zurr

in which the first case the air discharge model change pending model plate D ' is semi-improved, while in the latter case cut at 55, the left half of which is a top plate 9' with

the exposure of the finished form can be seen at the end of the attached model. Also the cross

The mold production process before the finished mold slide 108 is shown in the left half of FIG

thrust by admitting compressed air into this venting reproduced in half section, so that only one forward

opening an easier detachment of the prefabricated two slide guide rails 109 recognizable form upper or lower surface of the two press 60 is. These guide rails 109 sit down, as au;

itempeln Ba or Bb is effected. Fig. 2 can be seen, expediently after both sides

The formation of the ram drives Fa, Fb of the boxless molding machine 101 continues, so that the

as ring-shaped pressure medium drives, the cylinder cross slide 108 of which with reference to the molding machine

Body-shaped piston rod elements 106 can be moved together 101 to both sides and with these and the two plate-shaped elements, with 65 optionally one of the two model plates C in each case

Through openings 163 provided press rams or D ' can be used.

Ba and Bb, the walls of the two sand molds For the purpose of explaining the invention

chambers 155 α or 1556 of the Formsnndbehälters Ben method is now the mode of action dei

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13 14

155b described above with reference to FIGS. Space Bb press ram through into the Hohlauf Figs. 1, 3 and 6 to 10 of the drawings the lower mold frame Cb is filled explained, wherein g in the F i. 6 and 7 and insheson- Now, the molding sand container 154 is more in FIGS. 8 to K) for the sake of simplicity 5 of the molding machine in a filling state, as shown in detail in FIGS. 1 and 3 through full excellent boundaries and are, are omitted. Punctuation is indicated. Both in the execution

Fig. 10 shows the arrangement in a working position of the empty shot as well as in the execution of the position, in which just by retracting the so-called filling shots, the model plate guide 103 of 122, designed as a gas-tight pattern plate D, the last finished form in the channel can be pushed out boxless onto the molding strand conveyor line Molding machine 101 was closed by opening the molding strand already located there and flap valve 159 on the suction line 160 of the closure. The pattern plate D is more closely connected, so that the men Ca and Cb or the upper and lower press 15 air located in the molding and the upper and lower molding wire spaces of the molding frames Ca and Cb are sucked off and the filling process is supported, stamps Ba and Bb are located in the upper limit- The air in these mold spaces reaches positions in which they push out the finished mold 123, which is not covered by the model halves, or insert the model plate D with bores 12 the upper plate and the lower plate allow model halves placed on it. the model plate D through into the interior of the

Now, by means of the pressure medium drives 20, the dell plate frame 1 and from there via the Füh- Ea and Eb the mold frames Ca and Cb tightly up to approximately channel 103 and the flap valve 159 in the stop on the model plate top or suction line 160, which leads to the compressor 150. The underside of the model plate is pushed towards the model plate. After the filling of the two mold frames has been completed. The mold frame spaces are now spaces with molding sand, the flap valve 159 is ready for Jen molding sand injection. This state is closed again. The control of the control valves is illustrated in Figure 3 of the drawings. Takes place b on initial 152a, 152 both in the empty shot as to make starting of the flaskless molding machine 101 in the weft fill such that in the container 151 first, the molding sand tank must be filled 154 accumulated compressed air must explosively in the pressure, and for this purpose one or meh - Lines 153 a and 1536 enters and thus another so-called "empty shot" is carried out. 30 abrupt transport of molding sand within the mold-Die molding sand feed takes place via the funnel 164 sand container 154 of the boxless molding machine 101 of the molding sand supply device when the mold filling slide 169 is open and thus also suddenly filled.
The upper sand chamber 155a and the mold can now be started with the pressing of the mold halves sand connection line 157 and fills via this 35. For this purpose, also part of the lower molding sand line 156 b pressure medium drives Fa and Fb of the upper press and the lower compressed air line 153 b, the stempeis Ba and the lower press ram Bb so approximate the molding sand limit in the former actuated by one that the two Press ram is relative to the dash-dotted line and in the latter by one of the two mold frames Ca and Cb as long as a solid line in FIG. 3 are indicated. Now move 40 in the direction of the pattern plate D until the desired degree of solidification of the two mold halves after the filling slide 169 has been closed. by opening the control valves 152a, 1526 th is reached. This state is shown in Fig. 6 of the so-called empty shot, that is, shown in the drawings.

the compressed air tank 151 accumulated pressure Now by simultaneous actuation air gets through the two compressed air lines 153 a 45 of the pressure medium drives Ea, Eb and Fa. Fb the two and 1536 in the sand container 154 and presses the Fprmhälfien from the pattern plate D and the In the upper molding sand chamber 155 a, attached model halves are withdrawn, as this borrowed molding sand through the openings 163 of the plat- F i g. 8 of the drawings shows. This process can be supported by ten-shaped press stamps Ba through into the space in that the channel-shaped model plate mold frame space enters through the opening of the mold frame Ca so that this 5 ° flap valve 161 is filled. At the same time, the guide 103 pushes the boxless molding machine 101 and the pressure supplied via the upper pressure line 153a, thereby pushing the inside of the pattern plate D to the compressed air, the molding sand connected in the molding sand connecting line 157 pipe 149 of the air compressor 150 down into the lower one. The inside of the model plate D on-molding sand line 1566 and the overpressure building over the lower 55 presses via module plate openings compressed air connection 1536, the compressed air flowing in presses 12 on the lower or surface of the upper one in addition to that in the lower molding sand pipe 1566 or lower mold half and thereby supports the found molding sand in the lower molding sand chamber separating process. Then the valve 161 is again 1556 in. Is closed by such a first.

Empty shot the lower molding sand chamber 1556 still 60 Now the pressure medium drive 119, 120 si

not completely filled with molding sand, it is actuated that the pattern plate D along its guide

Mold 103 is again removed from the box molding machine 101 via the molding sand filling device 158

sand let into the molding sand container 154 and pushed and onto the guide 107 of the compound slide

then another empty shot was executed, 108 opened and thereby pushed into its rest position

which in all likelihood will not turn 65. By actuating the pressure medium drive Hi

only the lower molding sand chamber 1556 of the box 120 is also closed with a certain time delay

loose molding machine 101 is filled with molding sand, the push fork 125 in its in FIGS. 1 and 2 i

Also reduce the position indicated by dash-dotted lines in the lower molding sand chamber

Claims (14)

pushed. As soon as the model plate D has reached its rest position in the compound slide 108, a core can optionally be inserted into the lower mold half by machine or by hand. The finished mold is now in a state which allows it to be closed. For this purpose, the pressure medium drives Ea. Eh and Fn, Fh the mold frame Ca, Cb and the ram Ba, Bb are each actuated simultaneously, so that the two mold halves move towards each other until finally the one shown in FIG. 9 of the drawings is reached. The finished mold 143 is now closed and is ready to be pushed out of the boxless molding machine 101. Before it can be pushed out, the finished mold must be released through the two mold frames Ca, Cb. This is done in turn by actuating the pressure medium drives Ea, Eb in such a way that the mold frames Ca, Cb move up and down relative to the rams Ba, Bb until their lower or upper edge is flush with the relevant pressing surfaces facing the finished mold the two ram runs. The system is now in the condition shown in Fig. 9 of the drawings for the boxless molding machine 101. The pressure medium drive 119, 120 of the molding strand conveyor line 102 is now actuated in the sense of reinserting the pattern plate D into the boxless molding machine 101. As a result, the just completed finished form 143 located in the molding machine is moved out onto the molding stretch conveyor line 102. The molding sand ball pegs which are still adhering to the finished mold 143 from the molding process and protrude into the press ram openings 163 are simply sheared off without damaging the finished mold in any way. The actuation of the pressure medium drive 119, 120 in the sense of reinserting the model plate D into the molding machine 101 and in the sense of ejecting the just completed finished form 143 from the molding machine also causes, with a certain time delay, a re-advance of the push rod 125 Vibrators arranged on all four sides. These vibrators are actuated before the finished mold halves are removed from the model halves attached to the model plate D, as is generally the case with casting molding machines. The functional sequences just described are preferably, as already mentioned above, controlled by a central control device which can be designed either hydraulically or electronically. Such program controls are known to those skilled in the art in many forms and need to be adapted to the control of the above-described functional processes of the molding system KLiner according to the invention, so that the description and illustration of such a control system is dispensed with in these explanations. Suffice it to say that the functionally correct control of the individual work processes is preferably controlled in the correct sequence by limit switches, with a central control system also being able to be provided by a program carrier if necessary. It goes without saying that every work step of the system according to the invention can also be controlled individually if necessary. 1. Procedure in boxless molding machines for injecting the molding sand from both above as well as from below through openings ίο an upper and a lower ram through in above and below a double-sided, horizontal model plate Molding frame into it, according to patent 1 583 526, characterized in that the molding sand is accelerated in two partial flows on its way to the ram, whose cross-sections each correspond to the full punch surfaces, and that those on the press punches attacking forces act outside these molding sand flows. 2. Molding machine for performing the method according to claim 1 with a pneumatic Molding sand injection device, vertically movable, pressure-medium operated, with molding sand The press ram provided with passage openings, vertically displaceable counter ram provided with molding sand passage openings, vertically movable, pressure medium-operated mold frame and horizontally linearly displaceable model plate, according to patent 1 583 526, characterized in that the edges of the press ram (Bb) and of the counter ram (Ba) respectively on telescopic extensions (106) of the walls of an upper and a lower, fixed tubular sand chamber (15Sb ₁ 155 a) of the molding sand injection device that can each be pressurized with compressed gas and that guides the respective molding sand partial flow, and that the means (e.g. 105) to transmit force to the ram or to the counter ram, attack each of these telescopic extensions or radially outside of these telescopic extensions on the stamps themselves. 3. Molding machine according to claim 2, characterized in that the cylinder (104) of the Pressure medium drive [Fb) of the press ram [Bb) has an annular cylinder cross-section, forms the pipe wall of the sand chamber (155 f>) assigned to the press ram and houses an annular piston (105) which has a piston rod with an annular cross-section and the telescopic extension of the sand chamber wall (106J is connected with a hern plate-shaped press ram. 4. Molding machine according to claim 2 or 3, characterized in that in a manner known per se, the Gegenstempcl (Ba) can be moved by means of a pressure medium drive (Fa) and that the cylinder (104) also this pressure medium drive bes has an annular cylinder space cross-section, the cylinder likewise forming the pipe wall of the sand chamber (155a) assigned to the counter-punch and accommodating an annular piston (105) which is connected to the plate-shaped counter- punch via a piston rod (106) with an annular cross-section and the telescopic extension of the sand chamber wall connected is. 209 610/245 I 941 18th 5. Molding machine according to one of claims 2 to 4, characterized in that the pressure medium drives (z. B. Ea, Eb) for moving the mold frame (Ca, Cb) are arranged radially outside the telescopic excerpts (106) of the sand chamber walls (F i g . 4). 6. Molding machine according to claim 5, characterized in that the pressure medium drives (z. B. Ea, Eb) for moving the mold frame (Ca, Cb) also have cylinder spaces (104 ') with annular pistons (105') which are annular in cross section (Fig . 5). 7. Molding machine according to one of claims 2 to 6, characterized in that the openings (163) in the press rams (Ba, Bb) are funnel-shaped (F i g. 3). 8. Molding machine according to one of claims 2 to 6, dadurci. characterized in that the press die openings (163) are formed between strips which are arranged like a grate in the die plane, preferably ao louvre-like, rotatable strips about their longitudinal axes. 9. Molding machine according to one of claims 2 to 8, characterized in that the press rams (Ba, Bb) on their sides facing the mold frame (Ca, Cb) have vents which have connection with cavities formed in the punch body, which in turn either in Channels opening into the outside atmosphere are connected or can be acted upon by vacuum or overpressure. 10. Molding machine according to one of claims to 9, characterized in that the upper (155 a) and lower (155 b) sand chamber together with two molding sand lines (156 σ, 156 b) and a connecting line (157) connecting them to one another in the Form vertical plane C-shaped sand container representing the machine frame, which has a filling device (158) connected to a sand bunker and one of two compressed gas lines (153a) at the upper C-arm and the other compressed gas line (153 b) at the lower C-arm (Fig. 3). U. Molding machine according to claim 10, characterized in that the heidenDruckgasleiüingen (153 a, 153 b) from a single, connected to a compressed gas container and containing a single valve containing compressed gas supply line branch off. 12. Molding machine according to claim 10, characterized in that separately arranged valves (152 a, 152 b) in the two compressed gas lines (153 a, 153 b) can be actuated by a common control mechanism either simultaneously or with an adjustable mutual time offset (Fig. 3 ). 13. Molding machine according to one of claims 10 to 12, characterized in that the molding sand filling device (158) has an upwardly opening funnel (164) opening from above into the molding sand container (156), the funnel (164) at the bottom by a pressure medium-actuated horizontal slide (171) , which is formed by a carriage (166) which can be moved in a horizontal guide (165) and a horizontal closure plate (169) which is attached to it by means of preferably spring-loaded control rods (167) and is provided with a lower seal, which is in the closed position as a result of the toggle action, is placed close to an upper opening of the molding sand container (FIG. 3). 14. Molding machine according to one of claims to 13, characterized in that the model plate guide (103) is designed as a gas-tight, via controlled valve means (159, 161) to a compressed gas source (162) or to a vacuum source (160) connectable channel and that the Model plate (D) is provided with frontal, correctly graduated sealing folds (112, 113) which, when the model plate is retracted in the molded position, seal off the end channel openings in a gas-tight manner (FIGS. 2 and 3). For this purpose 2 sheets of drawings